With the present deepwater developments on the increase it is foreseen that a dedicated market will develop for vesselsrncapable of intervening on subsea wells at a lesser cost than existing deepwater drilling units. Thereby (I) extend the life ofrndeepwater developments rendering additional profits and (II) adhere to minimum field production requirements as are beingrnrequired by the authorities more and more to date.rnThe paper describes the development of the concept for such a Well Intervention Vessel resulting from a combined effortrnbetween a Naval Architecture Design Bureau and a major rig equipment supplier with a focus on an open equipment structurernfacilitating the possible application of multiple levels of/and intervention solutions. The vessel will target Class B+/(II+) andrnClass C/(III) type interventions, based upon systems which will use risers and capable of retrieving completions. Input ofrnoperators as well as equipment- and service providers has been used in the development of the concept to develop the openrnsystem.rnThe proposed paper shall present in detail the design approach and basis, the concept design and the operational parameters ofrnthe deepwater well completion and intervention vessel. It will also address in detail the specific pieces of equipment to be usedrnon the vessel.
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